com.mckoi.database

Class NaturallyJoinedTable

java.lang.Object

com.mckoi.database.Table

com.mckoi.database.JoinedTable

com.mckoi.database.NaturallyJoinedTable

All Implemented Interfaces:

TableDataSource

public final class NaturallyJoinedTable
extends JoinedTable

A table that is the cartesian product of two tables. This provides better memory-use and efficiency than a materialized table backed by a VirtualTable.

Author:

Tobias Downer

Field Summary

Fields inherited from class com.mckoi.database.JoinedTable

column_filter, column_scheme, column_table, reference_list

Fields inherited from class com.mckoi.database.Table

DEBUG_QUERY

Constructor Summary

Constructors

Constructor and Description
NaturallyJoinedTable(Table left, Table right) Constructs the table.

Method Summary

Modifier and Type	Method and Description
int	getRowCount() Returns the number of rows stored in the table.
protected void	resolveAllRowsForTableAt(IntegerVector row_set, int table_num) Given an IntegerVector that represents a list of pointers to rows in this table, this resolves the rows to row indexes in the given parent table.
protected int	resolveRowForTableAt(int row_number, int table_num) Given a row and a table index (to a parent reference table), this will return the row index in the given parent table for the given row.

Methods inherited from class com.mckoi.database.JoinedTable

findFieldName, getCellContents, getColumnCount, getDatabase, getDataTableDef, getReferenceTables, getResolvedVariable, hasRootsLocked, init, lockRoot, printGraph, rowEnumeration, unlockRoot

Methods inherited from class com.mckoi.database.Table

all, allColumnMatchesValue, any, columnContainsCell, columnContainsValue, columnMatchesValue, columnMerge, compareCells, Debug, distinct, distinct, dumpTo, emptySelect, exhaustiveSelect, fastFindFieldName, getColumnDefAt, getColumnScheme, getFirstCellContent, getFirstCellContent, getLastCellContent, getLastCellContent, getSingleCellContent, getSingleCellContent, getSystem, getTableAccessState, getTTypeForColumn, getTTypeForColumn, join, orderByColumn, orderByColumn, orderByColumn, orderByColumns, orderedRowList, outside, rangeSelect, selectAll, selectAll, selectFirst, selectLast, selectRange, selectRest, simpleJoin, simpleSelect, singleRowSelect, toMap, toString, union

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

NaturallyJoinedTable

public NaturallyJoinedTable(Table left,
                            Table right)

Constructs the table.

Method Detail

getRowCount

public int getRowCount()

Description copied from class: Table

Returns the number of rows stored in the table.

Specified by:

getRowCount in interface TableDataSource

Specified by:

getRowCount in class Table

resolveRowForTableAt

protected int resolveRowForTableAt(int row_number,
                                   int table_num)

Description copied from class: JoinedTable

Given a row and a table index (to a parent reference table), this will return the row index in the given parent table for the given row.

Specified by:

resolveRowForTableAt in class JoinedTable

resolveAllRowsForTableAt

protected void resolveAllRowsForTableAt(IntegerVector row_set,
                                        int table_num)

Description copied from class: JoinedTable

Given an IntegerVector that represents a list of pointers to rows in this table, this resolves the rows to row indexes in the given parent table. This method changes the 'row_set' IntegerVector object.

Specified by:

resolveAllRowsForTableAt in class JoinedTable